时间:2021-05-20
这篇文章整理了C#对Access数据库的查询、添加记录、删除记录和更新数据等一系列的操作示例,有需要的可以参考学习。
首先是AccessHelper.cs,网上有下载,下面附送一份;
定义变量,设置列标题;
private AccessHelper achelp;...... private void Form1_Load(object sender, EventArgs e) { achelp = new AccessHelper(); string sql1 = "select * from ycyx"; databind1(sql1); dataGridView1.Columns[0].Visible = false; dataGridView1.Columns[1].HeaderCell.Value = "服务号码"; dataGridView1.Columns[2].HeaderCell.Value = "客户名称"; dataGridView1.Columns[3].HeaderCell.Value = "归属地区"; dataGridView1.Columns[4].HeaderCell.Value = "当前品牌"; dataGridView1.Columns[5].HeaderCell.Value = "当前套餐"; dataGridView1.Columns[6].HeaderCell.Value = "当前状态"; }显示数据表全部内容;
private void databind1(string sqlstr){ DataTable dt = new DataTable(); dt = achelp.GetDataTableFromDB(sqlstr); dataGridView1.DataSource = dt;}读取要更新记录到更新窗体控件;
private void button3_Click(object sender, EventArgs e){ if (dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value == null) { MessageBox.Show("没有选中行。", "M营销"); return; } //f3.Owner = this; DataTable dt = new DataTable(); object oid = dataGridView1.SelectedRows[0].Cells[0].Value; string sql = "select * from ycyx where ID=" + oid; dt = achelp.GetDataTableFromDB(sql); f3 = new Form3(); f3.id = int.Parse(oid.ToString()); //f3.id = 2; f3.Text1 = dt.Rows[0][1].ToString(); f3.Text2 = dt.Rows[0][2].ToString(); f3.Text3 = dt.Rows[0][3].ToString(); f3.Text4 = dt.Rows[0][4].ToString(); f3.Text5 = dt.Rows[0][5].ToString(); f3.Text6 = dt.Rows[0][6].ToString(); f3.ShowDialog(); }添加记录;
private void button4_Click(object sender, EventArgs e){ if (textBox1.Text == "" && textBox2.Text == "" && textBox3.Text == "" && textBox4.Text == "" && textBox5.Text == "" && textBox6.Text == "") { MessageBox.Show("没有要添加的内容", "M营销添加"); return; } else { string sql = "insert into ycyx (fwhm,khmc,gsdq,dqpp,dqtc,dqzt) values ('" + textBox1.Text + "','" + textBox2.Text + "','"+ textBox3.Text + "','"+ textBox4.Text + "','"+ textBox5.Text + "','"+ textBox6.Text + "')"; int ret = achelp.ExcuteSql(sql); string sql1 = "select * from ycyx"; databind1(sql1); textBox1.Text = ""; textBox2.Text = ""; textBox3.Text = ""; textBox4.Text = ""; textBox5.Text = ""; textBox6.Text = ""; }}删除记录;
private void button2_Click(object sender, EventArgs e){ if (dataGridView1.SelectedRows.Count < 1 || dataGridView1.SelectedRows[0].Cells[1].Value == null) { MessageBox.Show("没有选中行。", "M营销"); } else { object oid = dataGridView1.SelectedRows[0].Cells[0].Value; if (DialogResult.No == MessageBox.Show("将删除第 " + (dataGridView1.CurrentCell.RowIndex + 1).ToString() + " 行,确定?", "M营销", MessageBoxButtons.YesNo)) { return; } else { string sql = "delete from ycyx where ID=" + oid; int ret = achelp.ExcuteSql(sql); } string sql1 = "select * from ycyx"; databind1(sql1); }}查询;
private void button13_Click(object sender, EventArgs e){ if (textBox23.Text == "") { MessageBox.Show("请输入要查询的当前品牌", "M营销"); return; } else { string sql = "select * from ycyx where dqpp='" + textBox23.Text + "'"; DataTable dt = new System.Data.DataTable(); dt = achelp.GetDataTableFromDB(sql); dataGridView1.DataSource = dt; }}用户确定显示或不显示哪些数据列;
private void button15_Click(object sender, EventArgs e){ if (checkBox1.Checked == true) { dataGridView1.Columns[1].Visible = true; } else { dataGridView1.Columns[1].Visible = false; } if (checkBox2.Checked == true) { dataGridView1.Columns[2].Visible = true; } else { dataGridView1.Columns[2].Visible = false; } if (checkBox3.Checked == true) { dataGridView1.Columns[3].Visible = true; } else { dataGridView1.Columns[3].Visible = false; } if (checkBox4.Checked == true) { dataGridView1.Columns[4].Visible = true; } else { dataGridView1.Columns[4].Visible = false; } if (checkBox5.Checked == true) { dataGridView1.Columns[5].Visible = true; } else { dataGridView1.Columns[5].Visible = false; } if (checkBox6.Checked == true) { dataGridView1.Columns[6].Visible = true; } else { dataGridView1.Columns[6].Visible = false; }}更新数据;
public partial class Form3 : Form { private AccessHelper achelp; private int iid; public Form3() { InitializeComponent(); achelp = new AccessHelper(); iid = 0; } // 更新 private void button1_Click(object sender, EventArgs e) { try { //UPDATE Person SET Address = 'Zhongshan 23', City = 'Nanjing'WHERE LastName = 'Wilson' string sql = "update ycyx set fwhm='"+textBox1.Text+"',khmc='"+textBox2.Text+"',gsdq='"+textBox3.Text+"',dqpp='"+textBox4.Text+ "',dqtc='"+textBox5.Text+"',dqzt='"+textBox6.Text+"' where ID="+iid; int ret = achelp.ExcuteSql(sql); if (ret > -1) { this.Hide(); MessageBox.Show("更新成功", "M营销"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void Form3_Load(object sender, EventArgs e) { } public int id { get { return this.iid; } set { this.iid = value; } } public string Text1 { get { return this.textBox1.Text; } set { this.textBox1.Text = value; } } public string Text2 { get { return this.textBox2.Text; } set { this.textBox2.Text = value; } } public string Text3 { get { return this.textBox3.Text; } set { this.textBox3.Text = value; } } public string Text4 { get { return this.textBox4.Text; } set { this.textBox4.Text = value; } } public string Text5 { get { return this.textBox5.Text; } set { this.textBox5.Text = value; } } public string Text6 { get { return this.textBox6.Text; } set { this.textBox6.Text = value; } } //取消 private void button2_Click(object sender, EventArgs e) { this.Hide(); } }}注意此处有一个技巧;C# Winform,在窗体之间传值,或在一个窗体中设置另一个窗体的控件的值时,有多种方式;最好方式是如上代码所示;使用.net的get、set属性;
控件是一个窗体的私有变量,不能在另一个窗体中直接访问;为了在a窗体中设置b窗体的控件的值,对b窗体的控件都添加一个带get、set的公共属性,就可在a中设置b中控件的值,具体看代码;
以上就是C#对Access进行增删改查的完整示例代码,希望对大家学习C#能有所帮助。
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